Why do Vishnu and TurboXS have different stock WRX dyno #'s?

[Mugen13]

Vishnu says that the WRX makes 183.5hp and 186ft-lbs TQ and Turbo XS says their WRX made 168.0 hp@ 5733 rpm and173.0 ft-lbs @ 3518 rpm.

that is a huge difference. So what are other i-club members putting down stock?

Vishunu stage 0 vs. stock http://i-club.com/imprezer/stage_0_vs_stock.jpg
Turbo XS stage 1 vs. stock http://www.turboxs.com/turboxs_2002_...ge_1_hp_vs.htm

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[Subi-fied]

Because Vishnu is too cheap to buy an AWD dyno.

[Subi-fied]

....Vishnu disconnects the rear drivetrain and turns the car into a FWD for testing purposes. This causes higher numbers since the loss isn't as great.....

[eric m.]

it's just a reference point to see how much improvement the "stage" kits provide over stock. just look at the before and after numbers for each vendor respectively, instead of comparing one to another, or else results will not be accurate. the best thing would be for all the vendors to get together at the same dyno and do a test to see what the numbers are. that's the only way they will be somewhat accuarate, and still dyno results can vary as much as 5HP or more.

[Chris02WRX]

Vishnu uses a Dynojet. TurboXS uses a Dynapack.

[z&cobb]

Originally posted by Chris02WRX
Vishnu uses a Dynojet. TurboXS uses a Dynapack.

At least no one is using a one-wheel dynamometer, but I suppose that would get closer to the "crank" HP.

[elgorey]

vishnu uses 2wd dyno
misleading

[TypeC]

Originally posted by Subi-fied
Because Vishnu is too cheap to buy an AWD dyno.

Not only that but TXS's had LOW numbers. Not just peak, but the curve is not at all like the others. I think they might have used a weak WRX (not to mention they use a diff dyno). at Cobb stock WRX's were at ~178 with 1000 miles and some at 193whp with a GOOD amount of miles (30K+).

-C

[SW00P_G]

So you can't tune on a 2 wheel dyno??

[Subi-fied]

Originally posted by SW00P_G
So you can't tune on a 2 wheel dyno??

Sure you can. Tuning has nothing to do with the way the dyno is setup. As long as there is an accurate before and after result then tuning can be done.

I just wish Vishnu would invest in an AWD dyno.

[Big Bear uk]

would you not break/overheat the centre diff by running the car in 2WD ????

[titsataki]

Originally posted by Subi-fied


Sure you can. Tuning has nothing to do with the way the dyno is setup. As long as there is an accurate before and after result then tuning can be done.

I just wish Vishnu would invest in an AWD dyno.

Vishnu has access to a dyno (2WD). Then they occasionally have access to an AWD dyno (DynoJet I believe). They have run their stage 0 at both and have published results.

Every time I have gone that route people came back to say that the numbers are not reliable and that dynos are more of a tuning tool than a standard way of measuring hp. Even same dynos can produce diff results and also same car can even produce different results. Shiv has mentioned that as much as a ECU reset can change the results. This is part of tuning on a piggy back ECU.

An AWD dyno is I heard around $100k. Not realy pocket change. Plus maintainance and service etc... Also the shop to base the dyno is needed. I can't imagine running this babay all day for several days off someones house/garage. People/neighbors will be very unhappy


Cheers

Nick